Shore Guy, If you leave it until the "moisture" can be detected by weight you're too bl**dy late!
That's why they invented radome moisture detection meters. (For any "heavies" that are reading this, these meters can also be useful for finding moisture in regular structural honeycomb sections - before they delaminate.) As with all things, prevention is better than cure so it is really important to check radomes for pin prick holes at every maintenance visit. It only takes a couple of minutes to look and its much easier to fix pin holes than to strip the inner skin, dry with infra red heaters and reskin the radome. And you still have to fix the pin holes afterwards anyway!
HighSpeed, Prof2MDA is right on. Honeywell, (now combined with the former AlliedSignal and then collectively combined into General Electric) are a good source of information. Check out the website at
www.cas.honeywell and use the contact information to politely scrounge for info. They are usually quite generous to genuine inquirers. E-mail me if you have any trouble and I'll see if I can help.
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Through difficulties to the cinema